Fused Deposition Modelling (FDM) is the technology that uses an additive manufacturing process to fabricate a product. This study aims to investigate the resistivity of both conductive composite materials through an extrusion process by FDM and calculating resistivity through a variety of tests. The study of the resistance of designing a prototype using conductive composite filaments through the AM process. This analysis more understandable when the basic equations of electricity used, which is V = IR. This equation shows the relationship between the voltage and the resistance, whereas the resistance increasing, the voltage will be decreasing. The test was done in different length, diameter, which is before and after extrusion. This study is also includes taking reading of light intensity for a functional embedded product by using a lux meter. Therefore, the resistivity by length and volume were measured for both materials, conductive ABS and protopasta- conductive filament, from the results found out that the protopasta-conductive filament is 56% more conductive than the conductive ABS.